# 导入相应的模块
import pygame
from pygame.locals import *
import time, random


class HeroPlane:
    '''玩家飞机（英雄）'''

    def __init__(self, screen_temp):
        self.x = 200
        self.y = 400
        self.screen = screen_temp
        self.image = pygame.image.load("./images/me.png")
        self.bullet_list = []  # 用于存放玩家的子弹列表

    def display(self):
        '''绘制玩家飞机'''
        # 绘制子弹
        for b in self.bullet_list:
            b.display()
            if b.move():
                self.bullet_list.remove(b)
        self.screen.blit(self.image, (self.x, self.y))

    def move_left(self):
        '''左移动飞机'''
        self.x -= 5
        if self.x <= 0:
            self.x = 0

    def move_right(self):
        '''右移动飞机'''
        self.x += 5
        if self.x >= 406:
            self.x = 406

    def fire(self):
        self.bullet_list.append(Bullet(self.screen, self.x, self.y))
        print(len(self.bullet_list))

class Bullet:
    '''子弹类'''

    def __init__(self, screen_temp, x, y):
        self.x = x + 53
        self.y = y
        self.screen = screen_temp
        self.image = pygame.image.load("./images/pd.png")

    def display(self):
        '''绘制子弹'''
        self.screen.blit(self.image, (self.x, self.y))

    def move(self):
        self.y -= 10
        if self.y <= -20:
            return True

    def epmove(self):
        self.y += 12
        if self.y > 568:
            return True

class EnemyPlane:
    '''敌机类'''

    def __init__(self, screen_temp):
        self.x = random.choice(range(408))
        self.y = -75
        self.screen = screen_temp
        self.rd = str(random.choice(range(3)))
        self.image = pygame.image.load("./images/e" + self.rd + ".png")
        self.bomb1 = pygame.image.load("./images/bomb1.png")
        self.bomb2 = pygame.image.load("./images/bomb2.png")
        self.bomb3 = pygame.image.load("./images/bomb3.png")
        self.bomb4 = pygame.image.load("./images/bomb4.png")
        self.bullet_list = []  # 用于存放敌机的子弹列表

    def display(self, hero):
        '''绘制敌机'''
        self.screen.blit(self.image, (self.x, self.y))
        # 绘制子弹
        for b in self.bullet_list:
            b.display()
            # 敌机子弹碰撞检验
            if b.x > hero.x + 12 and b.x < hero.x + 92 and b.y > 420 and b.y < 460:
                return  True
            if b.epmove():
                self.bullet_list.remove(b)


    def move(self, hero):
        self.y += 4
        # 降低敌机子弹发射频率
        if self.rd == '0' and self.y%64 == 1:
            self.bullet_list.append(Bullet(self.screen, self.x + 5, self.y + 70))
        elif self.rd == '1' and self.y%64 == 1:
            self.bullet_list.append(Bullet(self.screen, self.x - 4, self.y + 70))
        elif self.rd == '2' and self.y%48 == 1:
            self.bullet_list.append(Bullet(self.screen, self.x - 1, self.y + 70))
        # 敌机出屏幕
        if self.y > 568:
            return True
        # 遍历所有子弹,并执行碰撞检测
        for bo in hero.bullet_list:
            if bo.x > self.x + 12 and bo.x < self.x + 92 and bo.y > self.y + 20 and bo.y < self.y + 60:
                hero.bullet_list.remove(bo)
                return True

def key_control(hero_temp):
    '''键盘控制函数'''
    # 执行退出操作
    for event in pygame.event.get():
        if event.type == QUIT:
            print("exit()")
            exit()

    # 获取按键信息
    pressed_keys = pygame.key.get_pressed()
    # print(pressed_keys)
    # 做判断，并执行对象的操作
    if pressed_keys[K_LEFT] or pressed_keys[K_a]:
        print("Left...")
        hero_temp.move_left()

    elif pressed_keys[K_RIGHT] or pressed_keys[K_d]:
        print("Right...")
        hero_temp.move_right()

    if pressed_keys[K_SPACE]:
        print("space...")
        hero_temp.fire()


def main():
    '''主程序函数 '''
    # 创建游戏窗口，
    screen = pygame.display.set_mode((512, 568), 0, 0)

    # 创建一个游戏背景
    background = pygame.image.load("./images/bg2.jpg")

    # 创建玩家飞机（英雄）
    hero = HeroPlane(screen)
    m = -968
    enemylist = []  # 存放敌机的列表
    bomblist = [] # 存放爆炸图片
    while True:
        # 绘制画面
        screen.blit(background, (0, m))
        m += 2
        if m >= -200:
            m = -968

        # 绘制玩家飞机
        hero.display()

        # 执行键盘控制
        key_control(hero)

        # 随机绘制敌机
        if random.choice(range(50)) == 10:
            enemylist.append(EnemyPlane(screen))
        # 遍历敌机并绘制移动
        for em in enemylist:
            # 敌机子弹碰撞英雄飞机，游戏直接退出
            if em.display(hero):
                print('game over')
                exit()
            if em.move(hero):
                enemylist.remove(em)
                bomblist = [em.bomb1,em.bomb2,em.bomb3,em.bomb4]
                empos = [em.x,em.y]

        # 显示爆炸效果
        if bomblist != []:
            bb = bomblist.pop()
            screen.blit(bb, (empos[0] + 42, empos[1] + 25))



        # 更新显示
        pygame.display.update()

        # 定时显示
        time.sleep(0.04)


# 判断当前是否是主运行程序，并调用
if __name__ == "__main__":
    main()
